Artic Eldritch Abomination

Legendary Resistance (1/Day). If the Artic Eldritch Abomination fails a saving throw, it can choose to succeed instead.

Magic Resistance. The Artic Eldritch Abomination has advantage on saving throws against spells and other magical effects.

Siege Monster. The Artic Eldritch Abomination deals double damage to objects and structures.

Uncomprehensable Anatomy. One cannot understand this creature anatomy, if a creature scores a critical hit agaisnt the Artic Eldritch Abomination it must succeed in a DC 13 Inteligence saving throw, on a failure the damage is rolled as normal, on a success the critical hit resolves normally.

Eldritch Nature: The Artic Eldritch Abomination doesn´t need to breath, eat, drink nor sleep, and cannot be put to sleep by magical effects other than a wish spell.

Eldrich Regeneration: The Artic Eldritch Abomination is a creature of uncomprehensable biology, it has a fast regeneration rivaling trolls, at the start of its turn the Artic Eldritch Abomination it regains 10 hit points.

Multiattack: The Artic Eldritch Abomination can make two attacks, either being Bite, Tentacle Claw or Poisonous Harpoon Tentacle attacks.

Bite: Melee Weapon Attack: +12 to hit, 5ft range, attacks all creatures within a 10x10ft area, for 2d10+6 Piecing + 2d8 acid damage.

Tentacle Melee Weapon Attack: +12 to hit, 35ft range, one target, for 3d12+6 bludgeoning damage, a creature hit by this attack must succeed in a DC 20 Strenght saving throw being restrained by the eldritch tentacle on a failure, a creature can  escape by spending its action atempting to succeed in a DC 20 Strenght saving throw, the Artic Eldritch Abomination can have up to 10 creatures of large or smaller size restrained this way.

Claw: Melee Weapon Attack: +12 to hit, 10ft range, two targets within 5ft of eachother, for 3d8+6 slashing damage, a creature hit by this attack must succeed in a DC 20 Strenght saving throw, on a failure a creature falls prone and is pushed 5ft away from the Artic Eldritch Abomination.

Poisonous Harpoon Tentacle: Melee Weapon Attack: +12 to hit, 60ft range, one target, for 2d6+6 piercing + 1d8 poison damage, a creature hit by this attack must succeed in a DC 21 Constitution saving throw on a failure it takes additional 1d8 poison damage and falls poisoned until the end of their next turn, the Artic Eldrich Abomination has 10 available Poisonous Harpoon Tentacles, regaining 1 at the start of each of its turns.

Eldritch Wave: Recharge (5-6): All creatures within 30ft of the Artic Eldritch Abomination must succeed in a DC 21 Wisdom saving throw taking 6d10 psycic damage becoming paralized until the start of their next turn on a failure, half as much damage on a success and no additional effects. 

Frigtfull Screech (Recharge 6): As a bonus action the Artic Eldrich Abomination screeches a horrible sound that hits the will to combat of nearby creatures, all creatures within 60ft of the Artic Eldrich Abomination must succeed in a DC 21 Wisdom saving throw falling frigthened and unable to move closer to the Artic Eldrich Abomination until the end of their next turn 

Shamble: As a reaction to take damage the Artic Eldrich Abomination moves 15ft without taking attacks of oportunity.

The Artic Eldritch Abomination has 1 legendary action wich it can use at the end of its or other creatures turn.

Claw: (1 action) The Artic Eldrich Abomination makes a Claw attack agaisnt a creature within reach.